Agota Kristof (1935–2011) was born in Hungary but left the country with the Soviet invasion of 1956 to spend her life in French-speaking Switzerland, where she came to write her 'Trilogie des jumeaux' ('Twins Trilogy') in French some years later. This consists of Le Grand cahier (The Big Notebook) (1986), La Preuve (The Proof) (1988), and Le Troisième mensonge (The Third Lie) (1991) and is largely fictional: Kristof was a tomboy, although her brother was not a twin but a year older than her, for instance.
My other posts on Agota Kristof:
Agota Kristof: La Preuve | The Proof
Agota Kristof: Le Troisième mensonge |The Third Lie
Agota Kristof: C'est égal: nouvelles